Hi, I am tring to install a factory Tach in my 86 Grand Prix ,I have something called a tach filter that plugs into the distributer could someone tell me ,where does the other end of the wire hook to? Mine had been cut so Im not sure if it had a plug on that end also or not. Is this the only wire to hook up to this thing? Thanks!!Jerry
Factory Tach wiring
- Thread starter Poncho-gp
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Im not sure what exact wire it is on your car, but I think it is connected in between the distributor and tach input wire. If you can see what color wire is going into the tach and check for continuity with a dvom on wires by the distributor. It would be really helpful to have the wiring diagram for the car to be sure.
Can't remember, but I do want to let you know about a little switch at the rear of the tach...six vs eight cylinder.
Hi again, My car did not come with a tach,I want to add one that I bought to it . It came with a brown wire and tach filter that plugs into distributer but where it goes from that I do not know. Thanks for any help....Jerry
The other end may plug into the bulkhead connector. That is what I had to do to get mine to work. I also had to swap out the dash harness for one from a car with the factory gauge package on the Olds. Not sure about the Pontiac, but my engine harness came from a 1985 Grand Prix that had a 305 Chevy. I did not have a tach filter either, just a white wire.
Hi, Im not real sure what the point is but without it nothing would be hooked up to the distributer. and the tach don't have any plug or wire hooked to it. :? :?
Most times the tach filter is put in-line so that the "signal" from the distributor is clean when it comes into the tach. On some aftermarket tachs for the HEI, the inline filter is manual and is a small box with a screw in it. You adjust the screw to get an accurate reading on the tach, to keep the needle from jumping. On others it is preset and no adjustment is neccessary while others have an adjustment screw on the bach of the tach. As stated earlier, on the back of the Olds rallye pac cluster there is an "8 - 6" selector switch, which is for the # of cylinders. This is a type of filter too.
If it's easier to think of, it's kind of like an inline filter for an amp; if the power voltage is not clean coming in the amp won't be able to produce the bass punch you expect. Or if it's on the output, the highs and lows come out like crap-o-la through your sub-woofers, tweeters and speakers.
In any event if I were you I'd keep the filter and follow the instructions that came in the kit. Also take a trip to the library (or online) and try to find a Chilton / Haynes manual with wiring information or better yet order a wiring diagram for your car.
Good luck.
If it's easier to think of, it's kind of like an inline filter for an amp; if the power voltage is not clean coming in the amp won't be able to produce the bass punch you expect. Or if it's on the output, the highs and lows come out like crap-o-la through your sub-woofers, tweeters and speakers.
In any event if I were you I'd keep the filter and follow the instructions that came in the kit. Also take a trip to the library (or online) and try to find a Chilton / Haynes manual with wiring information or better yet order a wiring diagram for your car.
Good luck.
I have the Olds ralley pack guages with that switch on the back. Do I still need a tach filter? Will it hurt to put another one in, if that is a tach filter? I am rewiring my car, and did not find a tach filter in the old harness. I dont know if it came with one or if I lost it. I bought one just to be safe.
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